Regarding your brake drums, they should be measured to verify if they are within the spec for turning, they could have been turned a few times and be out of spec. New drums are available.
Getting the seals out of my '49 were a real pain. The seal OD from some seal manufacturers has was looks to be paint, which they claim (both CR and National) improves the seal's fit in the bore, which makes for difficulty when time to replace.
Regarding Pep Boys, about 10 years ago, we were passing through Santa Barbara in my Bronco, and the master cylinder went out late Saturday evening. Went to Pep Boys first thing Sunday morning over on State St., and in 2 hours I had a new Raybestos MC, and was on the road. Fine work and service. I was prepared for the opposite. I've had my company car in there a few times for lease company service and they are now using very el cheapo parts. No longer are the shelves stocked with the brand names we would recognize.